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Re: [Xen-devel] [PATCH 7] MCA: simplify mce actoin, and some update of m

To: "Liu, Jinsong" <jinsong.liu@xxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 7] MCA: simplify mce actoin, and some update of mem err handler for future SRAR extension
From: Keir Fraser <keir@xxxxxxx>
Date: Sat, 14 May 2011 10:45:18 +0100
Cc: "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>, "Li, Xin" <xin.li@xxxxxxxxx>
Delivery-date: Sat, 14 May 2011 02:46:19 -0700
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Thread-topic: [Xen-devel] [PATCH 7] MCA: simplify mce actoin, and some update of mem err handler for future SRAR extension
User-agent: Microsoft-Entourage/12.23.0.091001
I don't seem to have this one in my queue. You should resend.

 -- Keir

On 13/05/2011 15:34, "Liu, Jinsong" <jinsong.liu@xxxxxxxxx> wrote:

> Jan and Keir,
> 
> Any comments?
> 
> Thanks
> Jinsong
> 
> 
> Liu, Jinsong wrote:
>> MCA: simplify mce actoin, and some update of mem err handler for
>> future SRAR extension
>> 
>> This patch simplify mce_action(). Basically the 2 set of mce status
>> flags MCA_... and MCER_... are highly functional similar. This patch
>> remove the redundant middle-level flag MCA_..., and its related data
>> structure and function, so that mce_action() logic is more clean and
>> simpler.    
>> This patch also update mem err handler. intel_memerr_dhandler() will
>> be commonly used by SRAO and SRAR, so for the extension of future
>> SRAR case, this patch remove the default fail flag from
>> intel_memerr_dhandler() outside to SRAO/SRAR level, since only
>> SRAO/SRAR handler itself has the knowledge of how to handle the
>> failure when mem err handler fail.
>> 
>> Signed-off-by: Liu, Jinsong <jinsong.liu@xxxxxxxxx>
>> 
>> diff -r e7cd79cd6626 xen/arch/x86/cpu/mcheck/mce_intel.c
>> --- a/xen/arch/x86/cpu/mcheck/mce_intel.c Sun May 08 13:39:40 2011
>> +0800 +++ b/xen/arch/x86/cpu/mcheck/mce_intel.c Sun May 08 18:15:13
>> 2011 +0800 @@ -172,23 +172,14 @@ static unsigned int __read_mostly
>>  mce_dh static unsigned int __read_mostly mce_dhandler_num;
>>  static unsigned int __read_mostly mce_uhandler_num;
>> 
>> -enum mce_result
>> -{
>> -    MCER_NOERROR,
>> -    MCER_RECOVERED,
>> -    /* Not recoverd, but can continue */
>> -    MCER_CONTINUE,
>> -    MCER_RESET,
>> -};
>> -
>>  /* Maybe called in MCE context, no lock, no printk */
>>  static enum mce_result mce_action(struct cpu_user_regs *regs,
>>                        mctelem_cookie_t mctc)
>>  {
>>      struct mc_info *local_mi;
>> -    enum mce_result ret = MCER_NOERROR;
>> +    enum mce_result bank_result = MCER_NOERROR;
>> +    enum mce_result worst_result = MCER_NOERROR;
>>      struct mcinfo_common *mic = NULL;
>> -    struct mca_handle_result mca_res;
>>      struct mca_binfo binfo;
>>      const struct mca_error_handler *handlers = mce_dhandlers;
>>      unsigned int i, handler_num = mce_dhandler_num;
>> @@ -217,7 +208,7 @@ static enum mce_result mce_action(struct
>>      /* Processing bank information */
>>      x86_mcinfo_lookup(mic, local_mi, MC_TYPE_BANK);
>> 
>> -    for ( ; ret != MCER_RESET && mic && mic->size;
>> +    for ( ; bank_result != MCER_RESET && mic && mic->size;
>>            mic = x86_mcinfo_next(mic) )
>>      {
>>          if (mic->type != MC_TYPE_BANK) {
>> @@ -225,34 +216,20 @@ static enum mce_result mce_action(struct
>>          }
>>          binfo.mib = (struct mcinfo_bank*)mic;
>>          binfo.bank = binfo.mib->mc_bank;
>> -        memset(&mca_res, 0x0f, sizeof(mca_res));
>> +        bank_result = MCER_NOERROR;
>>          for ( i = 0; i < handler_num; i++ ) {
>>              if (handlers[i].owned_error(binfo.mib->mc_status))
>>              {
>> -                handlers[i].recovery_handler(&binfo, &mca_res);
>> -
>> -                if (mca_res.result & MCA_OWNER)
>> -                    binfo.mib->mc_domid = mca_res.owner;
>> -
>> -                if (mca_res.result == MCA_NEED_RESET)
>> -                    ret = MCER_RESET;
>> -                else if (mca_res.result == MCA_RECOVERED)
>> -                {
>> -                    if (ret < MCER_RECOVERED)
>> -                        ret = MCER_RECOVERED;
>> -                }
>> -                else if (mca_res.result == MCA_NO_ACTION)
>> -                {
>> -                    if (ret < MCER_CONTINUE)
>> -                        ret = MCER_CONTINUE;
>> -                }
>> +                handlers[i].recovery_handler(&binfo, &bank_result);
>> +                if (worst_result < bank_result)
>> +                    worst_result = bank_result;
>>                  break;
>>              }
>>          }
>>          ASSERT(i != handler_num);
>>      }
>> 
>> -    return ret;
>> +    return worst_result;
>>  }
>> 
>>  /*
>> @@ -608,7 +585,7 @@ struct mcinfo_recovery *mci_add_pageoff_
>> 
>>  static void intel_memerr_dhandler(
>>               struct mca_binfo *binfo,
>> -             struct mca_handle_result *result)
>> +             enum mce_result *result)
>>  {
>>      struct mcinfo_bank *bank = binfo->mib;
>>      struct mcinfo_global *global = binfo->mig;
>> @@ -618,7 +595,6 @@ static void intel_memerr_dhandler(
>>      uint64_t mc_status, mc_misc;
>> 
>>      mce_printk(MCE_VERBOSE, "MCE: Enter UCR recovery action\n");
>> -    result->result = MCA_NEED_RESET;
>> 
>>      mc_status = bank->mc_status;
>>      mc_misc = bank->mc_misc;
>> @@ -626,7 +602,6 @@ static void intel_memerr_dhandler(
>>          !(mc_status & MCi_STATUS_MISCV) ||
>>          ((mc_misc & MCi_MISC_ADDRMOD_MASK) != MCi_MISC_PHYSMOD) )
>>      {
>> -        result->result |= MCA_NO_ACTION;
>>          dprintk(XENLOG_WARNING,
>>              "No physical address provided for memory error\n");
>>          return;
>> @@ -644,23 +619,19 @@ static void intel_memerr_dhandler(
>> 
>>      /* This is free page */
>>      if (status & PG_OFFLINE_OFFLINED)
>> -        result->result = MCA_RECOVERED;
>> +        *result = MCER_RECOVERED;
>>      else if (status & PG_OFFLINE_PENDING) {
>>          /* This page has owner */
>>          if (status & PG_OFFLINE_OWNED) {
>> -            result->result |= MCA_OWNER;
>> -            result->owner = status >> PG_OFFLINE_OWNER_SHIFT;
>> +            bank->mc_domid = status >> PG_OFFLINE_OWNER_SHIFT;
>>              mce_printk(MCE_QUIET, "MCE: This error page is ownded"
>> -              " by DOM %d\n", result->owner);
>> -            /* Fill vMCE# injection and vMCE# MSR virtualization "
>> -             * "related data */
>> -            bank->mc_domid = result->owner;
>> +              " by DOM %d\n", bank->mc_domid);
>>              /* XXX: Cannot handle shared pages yet
>>               * (this should identify all domains and gfn mapping to
>>               *  the mfn in question) */
>> -            BUG_ON( result->owner == DOMID_COW );
>> -            if ( result->owner != DOMID_XEN ) {
>> -                d = get_domain_by_id(result->owner);
>> +            BUG_ON( bank->mc_domid == DOMID_COW );
>> +            if ( bank->mc_domid != DOMID_XEN ) {
>> +                d = get_domain_by_id(bank->mc_domid);
>>                  ASSERT(d);
>>                  gfn = get_gpfn_from_mfn((bank->mc_addr) >>
>> PAGE_SHIFT); 
>> 
>> @@ -683,7 +654,7 @@ static void intel_memerr_dhandler(
>>                        global->mc_gstatus) == -1 )
>>                  {
>>                      mce_printk(MCE_QUIET, "Fill vMCE# data for DOM%d
>> " -                      "failed\n", result->owner);
>> +                      "failed\n", bank->mc_domid);
>>                      goto vmce_failed;
>>                  }
>> 
>> @@ -699,7 +670,7 @@ static void intel_memerr_dhandler(
>>                   * For xen, it has contained the error and finished
>>                   * its own recovery job.
>>                   */
>> -                result->result = MCA_RECOVERED;
>> +                *result = MCER_RECOVERED;
>>                  put_domain(d);
>> 
>>                  return;
>> @@ -718,11 +689,13 @@ static int intel_srao_check(uint64_t sta
>> 
>>  static void intel_srao_dhandler(
>>               struct mca_binfo *binfo,
>> -             struct mca_handle_result *result)
>> +             enum mce_result *result)
>>  {
>>      uint64_t status = binfo->mib->mc_status;
>> 
>>      /* For unknown srao error code, no action required */
>> +    *result = MCER_CONTINUE;
>> +
>>      if ( status & MCi_STATUS_VAL )
>>      {
>>          switch ( status & INTEL_MCCOD_MASK )
>> @@ -744,7 +717,7 @@ static int intel_default_check(uint64_t
>> 
>>  static void intel_default_mce_dhandler(
>>               struct mca_binfo *binfo,
>> -             struct mca_handle_result *result)
>> +             enum mce_result *result)
>>  {
>>      uint64_t status = binfo->mib->mc_status;
>>      enum intel_mce_type type;
>> @@ -752,9 +725,9 @@ static void intel_default_mce_dhandler(
>>      type = intel_check_mce_type(status);
>> 
>>      if (type == intel_mce_fatal || type == intel_mce_ucr_srar)
>> -        result->result = MCA_NEED_RESET;
>> -    else if (type == intel_mce_ucr_srao)
>> -        result->result = MCA_NO_ACTION;
>> +        *result = MCER_RESET;
>> +    else
>> +        *result = MCER_CONTINUE;
>>  }
>> 
>>  static const struct mca_error_handler intel_mce_dhandlers[] = {
>> @@ -764,7 +737,7 @@ static const struct mca_error_handler in
>> 
>>  static void intel_default_mce_uhandler(
>>               struct mca_binfo *binfo,
>> -             struct mca_handle_result *result)
>> +             enum mce_result *result)
>>  {
>>      uint64_t status = binfo->mib->mc_status;
>>      enum intel_mce_type type;
>> @@ -776,10 +749,10 @@ static void intel_default_mce_uhandler(
>>      /* Panic if no handler for SRAR error */
>>      case intel_mce_ucr_srar:
>>      case intel_mce_fatal:
>> -        result->result = MCA_NEED_RESET;
>> +        *result = MCER_RESET;
>>          break;
>>      default:
>> -        result->result = MCA_NO_ACTION;
>> +        *result = MCER_CONTINUE;
>>          break;
>>      }
>>  }
>> diff -r e7cd79cd6626 xen/arch/x86/cpu/mcheck/x86_mca.h
>> --- a/xen/arch/x86/cpu/mcheck/x86_mca.h Sun May 08 13:39:40 2011 +0800
>> +++ b/xen/arch/x86/cpu/mcheck/x86_mca.h Sun May 08 18:15:13 2011 +0800
>> @@ -124,36 +124,6 @@ void mcabanks_free(struct mca_banks *ban
>>  void mcabanks_free(struct mca_banks *banks);
>>  extern struct mca_banks *mca_allbanks;
>> 
>> -/* Below interfaces are defined for MCA internal processing:
>> - * a. pre_handler will be called early in MCA ISR context, mainly
>> for early 
>> - *    need_reset detection for avoiding log missing. Also, it is
>> used to judge 
>> - *    impacted DOMAIN if possible.
>> - * b. mca_error_handler is actually a (error_action_index,
>> - *    recovery_hanlder pointer) pair. The defined recovery_handler
>> - *    performs the actual recovery operations such as page_offline,
>> cpu_offline 
>> - *    in softIRQ context when the per_bank MCA error matching the
>> corresponding 
>> - *    mca_code index. If pre_handler can't judge the impacted domain,
>> - *    recovery_handler must figure it out.
>> -*/
>> -
>> -/* MCA error has been recovered successfully by the recovery action*/
>> -#define MCA_RECOVERED (0x1 << 0)
>> -/* MCA error impact the specified DOMAIN in owner field below */
>> -#define MCA_OWNER (0x1 << 1)
>> -/* MCA error can't be recovered and need reset */
>> -#define MCA_NEED_RESET (0x1 << 2)
>> -/* MCA error did not have any action yet */
>> -#define MCA_NO_ACTION (0x1 << 3)
>> -
>> -struct mca_handle_result
>> -{
>> -    uint32_t result;
>> -    /* Used one result & MCA_OWNER */
>> -    domid_t owner;
>> -    /* Used by mca_error_handler, result & MCA_RECOVRED */
>> -    struct recovery_action *action;
>> -};
>> -
>>  /*Keep bank so that we can get staus even if mib is NULL */
>>  struct mca_binfo {
>>      int bank;
>> @@ -163,8 +133,14 @@ struct mca_binfo {
>>      struct cpu_user_regs *regs;
>>  };
>> 
>> -extern void (*mca_prehandler)( struct cpu_user_regs *regs,
>> -                        struct mca_handle_result *result);
>> +enum mce_result
>> +{
>> +    MCER_NOERROR,
>> +    MCER_RECOVERED,
>> +    /* Not recoverd, but can continue */
>> +    MCER_CONTINUE,
>> +    MCER_RESET,
>> +};
>> 
>>  struct mca_error_handler
>>  {
>> @@ -175,7 +151,7 @@ struct mca_error_handler
>>      */
>>      int (*owned_error)(uint64_t status);
>>      void (*recovery_handler)(struct mca_binfo *binfo,
>> -                    struct mca_handle_result *result);
>> +                    enum mce_result *result);
>>  };
>> 
>>  /* Global variables */
> 



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